author | Sam Lantinga <slouken@libsdl.org> |
Mon, 10 Jul 2006 21:04:37 +0000 | |
changeset 1895 | c121d94672cb |
parent 1475 | d45aefcac017 |
child 1984 | b910bcabec26 |
permissions | -rw-r--r-- |
0 | 1 |
/* |
2 |
SDL - Simple DirectMedia Layer |
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3 |
Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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5 |
This library is free software; you can redistribute it and/or |
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6 |
modify it under the terms of the GNU Lesser General Public |
0 | 7 |
License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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11 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 |
Lesser General Public License for more details. |
0 | 14 |
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15 |
You should have received a copy of the GNU Lesser General Public |
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16 |
License along with this library; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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Sam Lantinga |
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slouken@libsdl.org |
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*/ |
22 |
||
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/** |
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* \file SDL_endian.h |
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* |
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* Functions for reading and writing endian-specific values |
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*/ |
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#ifndef _SDL_endian_h |
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#define _SDL_endian_h |
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#include "SDL_stdinc.h" |
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|
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/* The two types of endianness */ |
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#define SDL_LIL_ENDIAN 1234 |
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#define SDL_BIG_ENDIAN 4321 |
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#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ |
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#if defined(__hppa__) || \ |
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defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ |
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(defined(__MIPS__) && defined(__MISPEB__)) || \ |
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defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ |
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defined(__sparc__) |
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#define SDL_BYTEORDER SDL_BIG_ENDIAN |
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#else |
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#define SDL_BYTEORDER SDL_LIL_ENDIAN |
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#endif |
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#endif /* !SDL_BYTEORDER */ |
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#include "begin_code.h" |
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/* Set up for C function definitions, even when using C++ */ |
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#ifdef __cplusplus |
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/* *INDENT-OFF* */ |
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extern "C" { |
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/* *INDENT-ON* */ |
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#endif |
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/* Use inline functions for compilers that support them, and static |
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functions for those that do not. Because these functions become |
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static for compilers that do not support inline functions, this |
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header should only be included in files that actually use them. |
63 |
*/ |
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#if defined(__GNUC__) && defined(__i386__) && \ |
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!(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */) |
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static __inline__ Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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__asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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static __inline__ Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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__asm__("xchgb %b0,%h0": "=Q"(x):"0"(x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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static __inline__ Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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Uint16 result; |
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84 |
|
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__asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); |
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return result; |
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} |
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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static __inline__ Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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__asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); |
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return x; |
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} |
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#else |
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static __inline__ Uint16 |
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SDL_Swap16(Uint16 x) |
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{ |
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return ((x << 8) | (x >> 8)); |
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} |
101 |
#endif |
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#if defined(__GNUC__) && defined(__i386__) |
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static __inline__ Uint32 |
c121d94672cb
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SDL_Swap32(Uint32 x) |
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{ |
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__asm__("bswap %0": "=r"(x):"0"(x)); |
c121d94672cb
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return x; |
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109 |
} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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static __inline__ Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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__asm__("bswapl %0": "=r"(x):"0"(x)); |
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115 |
return x; |
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} |
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This works on MacOS X too. :)
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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static __inline__ Uint32 |
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SDL_Swap32(Uint32 x) |
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120 |
{ |
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Uint32 result; |
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122 |
|
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123 |
__asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x)); |
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__asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x)); |
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__asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x)); |
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126 |
return result; |
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127 |
} |
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Optimize also for 68020 and higher CPUs
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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129 |
static __inline__ Uint32 |
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130 |
SDL_Swap32(Uint32 x) |
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{ |
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__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); |
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return x; |
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} |
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#else |
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static __inline__ Uint32 |
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SDL_Swap32(Uint32 x) |
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{ |
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return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | |
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(x >> 24)); |
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} |
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#endif |
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|
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#ifdef SDL_HAS_64BIT_TYPE |
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#if defined(__GNUC__) && defined(__i386__) |
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static __inline__ Uint64 |
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SDL_Swap64(Uint64 x) |
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{ |
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union |
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{ |
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struct |
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{ |
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Uint32 a, b; |
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} s; |
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Uint64 u; |
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} v; |
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v.u = x; |
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__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a), |
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"1"(v.s. |
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b)); |
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return v.u; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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static __inline__ Uint64 |
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SDL_Swap64(Uint64 x) |
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{ |
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__asm__("bswapq %0": "=r"(x):"0"(x)); |
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return x; |
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} |
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#else |
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static __inline__ Uint64 |
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SDL_Swap64(Uint64 x) |
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{ |
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Uint32 hi, lo; |
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/* Separate into high and low 32-bit values and swap them */ |
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lo = (Uint32) (x & 0xFFFFFFFF); |
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x >>= 32; |
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hi = (Uint32) (x & 0xFFFFFFFF); |
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x = SDL_Swap32(lo); |
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x <<= 32; |
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x |= SDL_Swap32(hi); |
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return (x); |
0 | 184 |
} |
185 |
#endif |
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186 |
#else |
|
187 |
/* This is mainly to keep compilers from complaining in SDL code. |
|
188 |
If there is no real 64-bit datatype, then compilers will complain about |
|
189 |
the fake 64-bit datatype that SDL provides when it compiles user code. |
|
190 |
*/ |
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191 |
#define SDL_Swap64(X) (X) |
|
192 |
#endif /* SDL_HAS_64BIT_TYPE */ |
|
193 |
||
194 |
||
195 |
/* Byteswap item from the specified endianness to the native endianness */ |
|
196 |
#if SDL_BYTEORDER == SDL_LIL_ENDIAN |
|
197 |
#define SDL_SwapLE16(X) (X) |
|
198 |
#define SDL_SwapLE32(X) (X) |
|
199 |
#define SDL_SwapLE64(X) (X) |
|
200 |
#define SDL_SwapBE16(X) SDL_Swap16(X) |
|
201 |
#define SDL_SwapBE32(X) SDL_Swap32(X) |
|
202 |
#define SDL_SwapBE64(X) SDL_Swap64(X) |
|
203 |
#else |
|
204 |
#define SDL_SwapLE16(X) SDL_Swap16(X) |
|
205 |
#define SDL_SwapLE32(X) SDL_Swap32(X) |
|
206 |
#define SDL_SwapLE64(X) SDL_Swap64(X) |
|
207 |
#define SDL_SwapBE16(X) (X) |
|
208 |
#define SDL_SwapBE32(X) (X) |
|
209 |
#define SDL_SwapBE64(X) (X) |
|
210 |
#endif |
|
211 |
||
212 |
/* Ends C function definitions when using C++ */ |
|
213 |
#ifdef __cplusplus |
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/* *INDENT-OFF* */ |
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} |
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/* *INDENT-ON* */ |
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#endif |
218 |
#include "close_code.h" |
|
219 |
||
220 |
#endif /* _SDL_endian_h */ |
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221 |
|
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222 |
/* vi: set ts=4 sw=4 expandtab: */ |